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ECE :: Satellite Communication

  1. In selecting a satellite system, the First determining factor is its

  2. A.
    EIRP
    B.
    antenna size
    C.
    coverage a sea
    D.
    antenna gain

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  3. Phase modulation is commonly-used for data transmission mainly because

  4. A.
    phase can be varied from + 180° to 180°
    B.
    it is resistant to the effects of noise
    C.
    demodulation is very easy
    D.
    it gives highest data rates that can be transmitted over a given channel

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  5. India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.

  6. A.
    geostationary
    B.
    equatorial
    C.
    polar
    D.
    sun-synchronous polar

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  7. Most of the communication satellites are stationed to the West of their service areas in order to reduce their

  8. A.
    eclipse period
    B.
    loss of power
    C.
    battery power provision
    D.
    mass of station-keeping fuel

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  9. The degradation of satellite solar cells with time is mainly due to

  10. A.
    their bombardment by electrons
    B.
    collection of meteoric dust
    C.
    increase in resistivity of silicon
    D.
    gradual leakage of charge carriers from the semiconductor material

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  11. The echo heard by a telephone user on a satellite channel can be removed by using

  12. A.
    a vocoder
    B.
    a multiplexer
    C.
    echo suppressor
    D.
    digital techniques

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  13. The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's

  14. A.
    intelligence gathering capacity
    B.
    domestic communications
    C.
    meteorological capability
    D.
    both (b) and (c)

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  15. Presently, the worlds's largest and most advanced multi-purpose communication satellite is

  16. A.
    INSAT-2
    B.
    Intelsat-V
    C.
    INSAT-ID
    D.
    Olympus-I

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  17. A satellite link uses different frequencies for receiving and transmitting in order to

  18. A.
    avoid interference from terrestrial microwave links
    B.
    avoid interference between its powerful transmitted signal and weak in coming signal
    C.
    minimise free-space losses
    D.
    maximise antenna gain

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  19. A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.

  20. A.
    92000
    B.
    920
    C.
    23000
    D.
    230

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